/*
 * jQuery Hotkeys Plugin
 * Copyright 2010, John Resig
 * Dual licensed under the MIT or GPL Version 2 licenses.
 *
 * Based upon the plugin by Tzury Bar Yochay:
 * http://github.com/tzuryby/hotkeys
 *
 * Original idea by:
 * Binny V A, http://www.openjs.com/scripts/events/keyboard_shortcuts/
 */

(function(jQuery){
  
  jQuery.hotkeys = {
    version: "0.8",
 
 specialKeys: {
   8: "backspace", 9: "tab", 13: "return", 16: "shift", 17: "ctrl", 18: "alt", 19: "pause",
 20: "capslock", 27: "esc", 32: "space", 33: "pageup", 34: "pagedown", 35: "end", 36: "home",
 37: "left", 38: "up", 39: "right", 40: "down", 45: "insert", 46: "del",
 96: "0", 97: "1", 98: "2", 99: "3", 100: "4", 101: "5", 102: "6", 103: "7",
 104: "8", 105: "9", 106: "*", 107: "+", 109: "-", 110: ".", 111 : "/",
 112: "f1", 113: "f2", 114: "f3", 115: "f4", 116: "f5", 117: "f6", 118: "f7", 119: "f8",
 120: "f9", 121: "f10", 122: "f11", 123: "f12", 144: "numlock", 145: "scroll", 191: "/", 224: "meta"
 },
 
 shiftNums: {
   "`": "~", "1": "!", "2": "@", "3": "#", "4": "$", "5": "%", "6": "^", "7": "&",
 "8": "*", "9": "(", "0": ")", "-": "_", "=": "+", ";": ": ", "'": "\"", ",": "<",
 ".": ">", "/": "?", "\\": "|"
 }
  };
  
  function keyHandler( handleObj ) {
    // Only care when a possible input has been specified
    if ( typeof handleObj.data !== "string" ) {
      return;
    }
    
    var origHandler = handleObj.handler,
 keys = handleObj.data.toLowerCase().split(" ");

handleObj.handler = function( event ) {
  // Don't fire in text-accepting inputs that we didn't directly bind to
  if ( this !== event.target && (/textarea|select/i.test( event.target.nodeName ) ||
    event.target.type === "text") ) {
      return;
    }
    
    // Keypress represents characters, not special keys
    var special = event.type !== "keypress" && jQuery.hotkeys.specialKeys[ event.which ],
    character = String.fromCharCode( event.which ).toLowerCase(),
    key, modif = "", possible = {};
  
  // check combinations (alt|ctrl|shift+anything)
    if ( event.altKey && special !== "alt" ) {
      modif += "alt+";
    }
    
    if ( event.ctrlKey && special !== "ctrl" ) {
      modif += "ctrl+";
    }
    
    // TODO: Need to make sure this works consistently across platforms
    if ( event.metaKey && !event.ctrlKey && special !== "meta" ) {
      modif += "meta+";
    }
    
    if ( event.shiftKey && special !== "shift" ) {
      modif += "shift+";
    }
    
    if ( special ) {
      possible[ modif + special ] = true;
      
    } else {
      possible[ modif + character ] = true;
      possible[ modif + jQuery.hotkeys.shiftNums[ character ] ] = true;
      
      // "$" can be triggered as "Shift+4" or "Shift+$" or just "$"
      if ( modif === "shift+" ) {
	possible[ jQuery.hotkeys.shiftNums[ character ] ] = true;
      }
    }
    
    for ( var i = 0, l = keys.length; i < l; i++ ) {
      if ( possible[ keys[i] ] ) {
	return origHandler.apply( this, arguments );
      }
    }
};
  }
  
  jQuery.each([ "keydown", "keyup", "keypress" ], function() {
    jQuery.event.special[ this ] = { add: keyHandler };
  });
  
})( jQuery );